In the diagram of the switchboard shown in the illustration, if one of the turbines should fail due to a throttle trip, what will happen? EL-0003

Correct Answer: Option A — device labeled 'BKR' for that alternator should automatically open because of the reverse power relay

A turbine throttle trip removes prime mover torque, causing the generator to act as a motor driven by the active bus. Per IEEE 45 and 46 CFR Subchapter J, the reverse power relay detects this dangerous directional power flow and immediately trips the generator circuit breaker (BKR) to protect the turbine from damage.